diff --git a/httpclient5/src/main/java/org/apache/hc/client5/http/async/methods/SimpleRequestBuilder.java b/httpclient5/src/main/java/org/apache/hc/client5/http/async/methods/SimpleRequestBuilder.java
index 9499d3913..a6acd7047 100644
--- a/httpclient5/src/main/java/org/apache/hc/client5/http/async/methods/SimpleRequestBuilder.java
+++ b/httpclient5/src/main/java/org/apache/hc/client5/http/async/methods/SimpleRequestBuilder.java
@@ -219,6 +219,7 @@ public class SimpleRequestBuilder extends AbstractRequestBuilder<SimpleHttpReque
         setBody(request.getBody());
     }
 
+    @Override
     protected void digest(final HttpRequest request) {
         super.digest(request);
     }
@@ -365,6 +366,7 @@ public class SimpleRequestBuilder extends AbstractRequestBuilder<SimpleHttpReque
         return this;
     }
 
+    @Override
     public SimpleHttpRequest build() {
         String path = getPath();
         SimpleBody bodyCopy = this.body;
diff --git a/httpclient5/src/main/java/org/apache/hc/client5/http/async/methods/SimpleResponseBuilder.java b/httpclient5/src/main/java/org/apache/hc/client5/http/async/methods/SimpleResponseBuilder.java
index 9ddc05db6..11e089904 100644
--- a/httpclient5/src/main/java/org/apache/hc/client5/http/async/methods/SimpleResponseBuilder.java
+++ b/httpclient5/src/main/java/org/apache/hc/client5/http/async/methods/SimpleResponseBuilder.java
@@ -132,6 +132,7 @@ public class SimpleResponseBuilder extends AbstractResponseBuilder<SimpleHttpRes
         return this;
     }
 
+    @Override
     public SimpleHttpResponse build() {
         final SimpleHttpResponse result = new SimpleHttpResponse(getStatus());
         result.setVersion(getVersion());
diff --git a/httpclient5/src/main/java/org/apache/hc/client5/http/impl/async/InternalH2ConnPool.java b/httpclient5/src/main/java/org/apache/hc/client5/http/impl/async/InternalH2ConnPool.java
index 5b6ce8662..aa886bb64 100644
--- a/httpclient5/src/main/java/org/apache/hc/client5/http/impl/async/InternalH2ConnPool.java
+++ b/httpclient5/src/main/java/org/apache/hc/client5/http/impl/async/InternalH2ConnPool.java
@@ -55,10 +55,12 @@ class InternalH2ConnPool implements ModalCloseable {
         this.connPool = new H2ConnPool(connectionInitiator, addressResolver, tlsStrategy);
     }
 
+    @Override
     public void close(final CloseMode closeMode) {
         connPool.close(closeMode);
     }
 
+    @Override
     public void close() {
         connPool.close();
     }